Tell me what to do.

I am married to a man whom I do not understand. I love this man with all my heart. I was so much madly in love when we were dating.......I was so loyal and faithful to him, not until when he made me pregnant. things changed, he started telling me all kind of bad words .........(he was not to marry a jobless woman, critised my body, my parents and told me many hurting words )but I still continued to stay. I tried to tell him how much I loved him and want to be his wife.....not until when his female cousin came to live with us...I took her in with open hands but little did I know that things will be worse....they became so close. when I tried to intervene between them he became so mad and beats me up....it came to a point the cousin left the house to live on her own.........on doing this my husband has made her house his........she buys him gifts....writes love messages and mostly eat his meals over there.......when I try to ask why he is doing this to me he tells me that if am not comfortable I should choose what I want....either to live with him or I go..............am so confused on what to.......I love this man so much..........but the measure of the pain he ha caused me is so deep........we have two kids together.